$OpenBSD: patch-gtk2_ardour_io_selector_h,v 1.1 2017/05/25 09:02:05 espie Exp $
We already depend on boost

Index: gtk2_ardour/io_selector.h
--- gtk2_ardour/io_selector.h.orig
+++ gtk2_ardour/io_selector.h
@@ -20,12 +20,8 @@
 #ifndef __ardour_ui_io_selector_h__
 #define __ardour_ui_io_selector_h__
 
-#if __GNUC__ >= 3
-#include <ext/slist>
-using __gnu_cxx::slist;
-#else
-#include <slist.h>
-#endif
+#include <boost/container/slist.hpp>
+using boost::container::slist;
 
 #include <string>
 
